The patch titled
Subject: mm: rmap: fix cache flush on THP pages
has been added to the -mm tree. Its filename is
mm-rmap-fix-cache-flush-on-thp-pages.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-rmap-fix-cache-flush-on-thp-pages.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-rmap-fix-cache-flush-on-thp-pages.patch
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------------------------------------------------------
From: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Subject: mm: rmap: fix cache flush on THP pages
Patch series "Fix some bugs related to ramp and dax", v7.
Patch 1-2 fix a cache flush bug, because subsequent patches depend on
those on those changes, there are placed in this series. Patch 3-4 are
preparation for fixing a dax bug in patch 5. Patch 6 is code cleanup
since the previous patch removes the usage of follow_invalidate_pte().
This patch (of 6):
The flush_cache_page() only remove a PAGE_SIZE sized range from the cache.
However, it does not cover the full pages in a THP except a head page.
Replace it with flush_cache_range() to fix this issue. At least, no
problems were found due to this. Maybe because the architectures that
have virtual indexed caches is less.
Link: https://lkml.kernel.org/r/20220403053957.10770-1-songmuchun@xxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20220403053957.10770-2-songmuchun@xxxxxxxxxxxxx
Fixes: f27176cfc363 ("mm: convert page_mkclean_one() to use page_vma_mapped_walk()")
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Reviewed-by: Yang Shi <shy828301@xxxxxxxxx>
Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Xiyu Yang <xiyuyang19@xxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Ross Zwisler <zwisler@xxxxxxxxxx>
Cc: Xiongchun Duan <duanxiongchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/rmap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/rmap.c~mm-rmap-fix-cache-flush-on-thp-pages
+++ a/mm/rmap.c
@@ -970,7 +970,8 @@ static bool page_mkclean_one(struct foli
if (!pmd_dirty(*pmd) && !pmd_write(*pmd))
continue;
- flush_cache_page(vma, address, folio_pfn(folio));
+ flush_cache_range(vma, address,
+ address + HPAGE_PMD_SIZE);
entry = pmdp_invalidate(vma, address, pmd);
entry = pmd_wrprotect(entry);
entry = pmd_mkclean(entry);
_
Patches currently in -mm which might be from songmuchun@xxxxxxxxxxxxx are
mm-hugetlb_vmemmap-introduce-arch_want_hugetlb_page_free_vmemmap.patch
arm64-mm-hugetlb-enable-hugetlb_page_free_vmemmap-for-arm64.patch
mm-hugetlb_vmemmap-cleanup-hugetlb_vmemmap-related-functions.patch
mm-hugetlb_vmemmap-cleanup-hugetlb_free_vmemmap_enabled.patch
mm-hugetlb_vmemmap-cleanup-config_hugetlb_page_free_vmemmap.patch
mm-rmap-fix-cache-flush-on-thp-pages.patch
dax-fix-cache-flush-on-pmd-mapped-pages.patch
mm-rmap-introduce-pfn_mkclean_range-to-cleans-ptes.patch
mm-pvmw-add-support-for-walking-devmap-pages.patch
dax-fix-missing-writeprotect-the-pte-entry.patch
mm-simplify-follow_invalidate_pte.patch
